The Mexico City Metropolitan Area (dark grey on the map), which occupies the Valley of Mexico, extends well beyond the northern boundary of the Federal District and includes many municipalities in the State of Mexico. The two administrations (the Federal District and the State of Mexico) have to work closely together in order to coordinate actions in the Metropolitan Area, which had a population in 2010 of 20.1 million.

Toluca, the capital of the State of México, is Mexico’s 4th largest urban area, and a fast-growing industrial city in its own right, with a 2010 population of 1.8 million.

Toluca’s airport (the “Licenciado Adolfo López Mateos International Airport”) is mainly used by low-cost carriers like Interjet, Volaris and Aeroméxico Connect as an alternative to using the Mexico City International Airport, which is more expensive and operating at close to capacity. Passenger traffic through Toluca airport has grown rapidly, from 145,000 passengers in 2002 to a peak of almost 4 million in 2008, before falling back to about 1 million passengers in 2012.

Not surprisingly, the Mexico City-Toluca highway is one of Mexico’s busiest major routes, linking the Federal District via Toluca (see map) to western Mexico.

In recent months, several related plans have been announced that are designed to improve the two major transportation issues in this area:

The near saturation of Mexico City International Airport

The very busy (and often slow) highway between Mexico City and Toluca

To ease the situation of Mexico City International Airport, the federal Communications and Transportation Secretariat (SCT) plans to expand the airport eastwards, onto 5,500 hectares of federal land. The expansion is likely to take several years to complete, and will increase flight capacity even though it will not include an additional terminal.

Meanwhile, State of Mexico authorities have authorized a second runway for the Toluca International Airport, which will significantly expand that airport’s capacity. The SCT has proposed that Toluca Airport become an alternate airport for Mexico City, with the two airports linked by high-speed trains.

The SCT has already announced that a new rail link between Toluca and Mexico City will be jointly financed by the federal government and the State of Mexico. The existing plan is for the first phase of the “Toluca-Valley of Mexico Interurban Passenger Train” to end at the Metro Observatorio station in Mexico City, but a later phase would extend this line to Mexico City Airport. This new 2.7-billion-dollar rail line, capable of carrying 300,000 passengers a day, will run from Toluca via the upscale Mexico City neighborhood of Santa Fe to Metro Observatorio, reducing the travel time between Toluca and Metro Observatorio by more than an hour to around 40 minutes, with corresponding positive environmental impacts. Construction of the new line, which will include 4 intermediate stations, is due to begin later this year, and scheduled to be completed by 2018.

A separate 115-million-dollar project is underway to reduce highway congestion between Toluca and Mexico City. To boost the road transport capacity between the two cities, a multi-lane second tier is being added to 15 kilometers of the existing Mexico City-Toluca highway, from La Marquesa to Paseo Tollocan, at the entrance to Toluca.